Install Gimp 2.8 in Ubuntu

Arguably Gimp is the best image editor in Ubuntu ( You can do a lot more than this )

Currently Ubuntu12.04 is running stable version Gimp 2.6.1. Great news is that Gimp 2.8 is available but not directly available through Ubuntu repository. So I tried 2.8 version and its much better and lot of performance improvements. single-window mode is the best features of 2.8 version.